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Core Java Interview Questions
Questions Answers Views Company eMail

Can we instantiate Interfaces?

Ericsson,

7 12992

What do you mean by the term transient?

Ericsson,

5 8895

What are the two ways you can synchronize a block of code?

Ericsson,

5 12016

Package1 and Package2 both have a method name lets say "methodA" with different implementation. When I import both the packages in a java class how can I use both the methods?

Ericsson,

7 8958

How can you sort dates?

TCS,

2 7935

Why to give the file name same as the public class name in java?

 3 5740

Is there any use of an abstract class which has no methods and no attributes?

Wipro,

1 4108

If your team member writes code with lots of static variables and static methods, will it cause any side effects?

KPIT,

3 6084

If I have 1000 objects and my requirement is to sort them quickly, then which collection would you recommend and why?

KPIT,

5 6896

I have a Person object with 5 variables and I want to store them in a file called Person.txt. What should I do?

KPIT,

3 5529

There is a Banking application. It has 2 types of account, Savings and Current. Write a method calculateInterest by passing an ArrayList of these account objects and calculate Interest accordingly. Write code for this situation

ABC, KPIT,

1 2577

If two threads call a static method at the same point of time, what will happen?

KPIT,

3 7445

There are 2 methods in a class. Both have the same method signature except for return types. Is this overloading or overriding or what is it?

KPIT,

9 10549

There are 2 classes, 1 LandAnimal and another WaterAnimal. There is another class Animal which wants to have the properties of both LandAnimal and WaterAnimal. How will you design this situation?

KPIT,

6 8593

I have a String s = java; What is the output when I say s.replaceAll('j', 'k'); Also what is the value of s after replacing?

KPIT,

8 8789

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Un-Answered Questions { Core Java }

Is array a class in java?

443

What is the purpose of using java.lang.class class?

479

What is an exception in java?

569

Is 0 true or false in java?

459

From the two, which would be easier to write: synchronization code for ten threads or two threads?

536




Where is the singleton class used?

504

What do you mean by Hash Map and Hash Table?

540

If system.exit (0); is written at the end of the try block, will the finally block still execute?

549

Can a string be null?

466

Can we create our own daemon thread?

476

How to connect to a remote database using Applet?

1989

Where is singleton pattern used?

458

What is the instance of an object?

497

What does it mean to flush a file?

504

What is the new line character?

489

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